Telautograph.



GEORGE S. TIFFANY, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE GRAY NATIONAL TELAUTOGRAPI-I COMPANY, OF NEW YORK, N. Y.

TELAUTOGRAPH.

SPECIFICATION formingpart of Letters Patent No. 668,893, dated February 26, 1901.

Application filed December 20, 1900. Serial No. 401473. (No model.)

To all whom it may concern: transmitting instrument as is necessary for Be it known that I, GEORGE S. TIFFANY, a an understanding of the present invention; citizen of the United States, residing in the and Fig. 2 is a section on the line 2 of Fig. 1. borough of Brooklyn, county of Kings, and In said drawings, B represents the trans- 5 State of New York, have invented certain mitting-tracer, (usually a pencil,) which is new and useful Improvements in Telautocarried by a pair of hinged arms 2 3, pivoted graphs, fully described and represented in the eccentrically to a pair of arms 4 5, connected, following specification and the accompanying respectively, to left and right hand main-line drawings, forming a part of the same. wires a b, leading to a suitable receivingin- 10 This invention relates to improvements in strument-such, for example, as that illus;

telautographic apparatus, and particularly trated in Fig. 2 of my applications before reto telautographic apparatus of that class in ferred to. As the transmitting-tracer B is which the movements of the receiving-pen in moved in writing the arms 4 5 are rotated unison with the transmitting-tracer are efthereby, and as the latter are thus rotated 15 fected by variations in the strength of the they effect, through means which will prescurrent sent over line from the transmitting ently be described, variations in the strength instrument to the receiving instrument, such of the currents sent over the main-line wires variations in current strength being in turn a b. effected by and corresponding to the move- Current is supplied to the main-line wires 2o ments of the transmitting-tracer. a b from two local circuits at the transmit- In two applications filed by me October 19, ting-station which are independent of the 1900, Serial Nos. 83,589 and 33,590, is shown main-line circuits a b and which include a and described at length a telautographic apsource of electric energy, as a battery H and paratus containing for each of the main-line two plates I 1, preferably arc-shaped and 25 circuits an independent circuit, including a which are wound with resistance-Wire w, from source of electric energy from which current which current is shunted intotheleftandright is supplied to the main-line circuit and also hand main-line circuits a b, respectively, means controlled by the transmitting-tracer from said independent circuits. These arewhereby the current so supplied to said mainshaped plates I I are located beneath the path 0 line circuit is varied in strength during the of movement of the rotary arms 4 5, so that writing operation according to the movetheir windings of wire 21; will be engaged by ments of the transmitting-tracer, such curcontacts, preferably rollers 15, carried by said rents of varying strength, through suitable arms, to which they are secured by springs devices at the receiving instrument, causing 15, which press them against the windings 5 the receiving-pen to move in unison with and of wire w. Through these contacts 15 and to reproduce the writing or other matter arms 4 5 currents are shunted from the indetraced by the transmitting-tracer. The prespendent circuits into the main-line circuits ent invention has especial reference to telaua b, respectively, which vary in strength actographic apparatus of this type, theim'provecording to the positions of these contacts be- 0 4o ments of the present invention relating partween the terminals t" 2' of the wires to, as will I ticularly to means controlled by the transpresently appear. The arc-shaped plates I mitting-tracer for so varying the strength of I, which support the wires w, are preferably the current supplied to the main-line circuits. of metal covered with insulating material The means provided for this purpose by the (preferablyasbestos) a, and the wire w wound 5 present invention may be used in conjuncthereon is also suitably insulated, as shown tion with any suitable devices at the receivat b, suchinsulation being removed, as shown, ing instrument-such, for example, as the where the rollers 15 bear against said wire. movable coils shown and described in my The rollers 15 are preferably of carbon, beaforesaid applications. cause such material will smooth out or grad- 50 In the accompanying drawings, Figure 1 uate the changes in the currents by graduillustrates, partly in diagram, so much of a ally bridging across the turns of the wire,

thus avoiding abrupt changes or jumps from one strength of current to another. The independent current-supplying circuits above referred to will now be described. With the master-switch D in the position in which it is shown, which is the position it occupies when the transmitting-tracer is hung up, the transmitting and receiving instruments are out of circuit. When, however, the master-switch is moved in the direction indicated by the arrow, Fig. 1, the negative pole of the battery will be connected by wire h, contactbrush 16, contact-plate 17 on the masterswitch, and wires h 71, to the terminals 2" of the wires to, while the positive pole of the battery H will be connected by wire h contact-brush 16, contact-plate 17 on the masterswitch D, and wires k h to the opposite terminals i of the wires w. The positive pole of the battery H is grounded at G, when master-switch D is moved to the position stated, by wire h connected to contact-spring 18, (contactingwith plate 17,) brush 16, and wire h so that with the parts in such position a current is passing through each of these independent circuits from the negative pole of the battery H and through the wires to, roll- .ers 15, springs 15, arms 4 5, wires ct 29, contact-plates 13 13 and brushes 14 14 to the main-line circuits at b, respectively, leading to the receiving instrument, which, as be fore stated, may be the receiving instrument shown and described in my said prior applications or any other suitable receiving-instrument. The strength of the currents delivered from these independentcircuits to the main-line circuits will, as before stated, be dependent upon the positions of the rollers 15 relatively to the opposite terminals t" t of wires w, since the nearer these rollers are to the terminals t" of said wires the greater the voltage between said rollers and the opposite terminals t of said wires or ground, and vice versa, or, in other words, if we assume the voltage of the battery H to be thirty volts and a roller 15 to be one-third the distance from the terminal '6 of one of the wires to the diiference of potential between the roller 15 and ground will be approximately ten volts, and if said roller be midway between the terminals t" t of said wire the difference of potential between the roller and ground will be approximately fifteen volts.

From this construction it results that as the arms 4 5 are rotated by the movement of the transmitting-tracer B the rollers 15 are caused to assume different positions relatively to the terminals 116 of the wires w and to shunt into the main-line circuits 0& 1) currents which vary in strength in accordance with the positions thus assumed by the rollers 15, and consequently in accordance with the positions assumed by the transmitting- Of course it will be understood that in the receivinginstrument,whieh-maybe connected with the transmitting instrument shown, the pen-arms of such receiving instrument instead of being connected to pen-arm drums, as in my prior applications before referred to, will be connected, respectively, to devices like the arms 4 5, so that the angular movements of the receiving-pen will be the same as those of the transmitting-tracer.

What I claim is 1. In a telautographic apparatus, the combination of a transmitting-tracer, a main-line circuit, an independent circuit including a source of electric energy, two relatively movable members, one included in the independent circuit and through which current is supplied to the main-line circuit, and the other leading therefrom to the main-line circuit, said first-named member consisting of resistance-wire wound upon a suitable support, and connections between the transmittingtracer and one of said members whereby the latter is moved relatively to the other member so as to shunt from said independent circuit into the main-line circuit currents varying in strength according to the movements of said transmitti'ng-tracer, substantially as described. I I

2. In a telautographic apparatus, the combination of a transmitting-tracer, a main-line circuit, an independent circuit including a source of electric energy and a member through which current is supplied therefrom to the main-line circuit, said member consisting of resistance-wire wound upon a suitable support, a movable member in contact therewith and connected with the main-line circuit, and connections between the transmitting tracer and said movable member whereby the latter is moved relatively to the other member so as to shunt from said inde pendent circuit into the main-line'circuit currents varying in strength according to the movements of said transmitting-tracer, substantially as described.

3. In a telautog'raphic apparatus, the combination of a transmitting-tracer, a main-line circuit, an independent circuit including a source of electric energy, two relativeiy movable members, one included in the independent circuit and through which current is supplied to the main-line circuit, and the other leading therefrom to the main-line circuit, said first-named member consisting of resistance-wire wound upon a suitable support and said second member of carbon, and connections between the transmitting-tracer and one of said members whereby the latter is moved relatively to the other member so as to shunt from said independent circuit into the mainline circuit currents varying in strength according to the movements of said transmitting-tracer, substantially as described.

4. In a telautographic apparatus, the combination of a transmitting-tracer, a main-line circuit, an independent circuit including a source of electric energy and a member through which current is supplied therefrom to the main-line circuit, said member consisting of resistance-Wire wound upon a suitable support, a movable member of carbon in contact therewith and connected with the mainline circuit, and connections between the transmitting-tracer and said movable member whereby the latter is moved relatively to the other member so as to shunt from said independent circuit into the main-line circuit currents varying in strength according to the movements of said transmitting-tracer, substantially as described.

5. In a telautographic apparatus, the combination of a transmitting-tracer, a main-line circuit, an independent circuit including a source of electric energy and a member through which current is supplied therefrom to the main-line circuit, said member consist- GEORGE S. TIFFANY.

' Witnesses:

T. F. KEHOE, S. WINTHAL. 

